Throwing-off device



Nov. 13, 1928. 1,691,830

G. P. SLATER THROWING OFF DEVI CE Filed July 28, 1926 Patented Nettie,192s. i I 1,691,836

om ga stares P TEN GUY I. SLATER, OF SAND SPRINGS, OKLAHOMA.

THROWING-OFF DEVICE.

Application filed July 28, 1928. Serial No. 125,498.

The object of this invention is to provide In order to accomplish theresult indicated improved means for throwing the ropes off in the mostefficient manner, I provide a horiof a bull wheel in a drilling rig, orthelike. zontal shaft 18 having a crank portion '19 A further object isto provide a throwing formed thereon, the shaft being mounted in ,5 offdevice useful under any similar condibearings, such as 20 andincluding;- or havtions, and Comprising a drum formed with a ingconnected.therewith a hand lever 21 pref- Y spiral groove, rotationimparted to the drum, erably extending to theopposite side of the byfrictional contact, serving to guide the derrick, to a pointclose to theusual bull wheel ropes from the grooves of the bull wheel. brake lever.10 A further ob ect is to provide for inou'nt- Carried by the crankportion 19 of shaft 15 wheel brake lever.

ing the spiral drum on a crank element of a 18 is a drum 23 providedwith a spiral groove 5 horizontal shaft adapted to be controlled by.2%,the groove preferably corresponding ina lever, preferably positionedon the other size or cross section with the grooves 16 of side of thederrick, close to the usual bull the bull wheel; 14:.

In the full line position of F igure 1, ref- With the foregoing andother objects in 'erence being had especially to the spirally view, theinvention consists in the novel congrooved drum, the ropes passing overthe struction and arrangement of elements debullwheel-do not engage thegrooves thereof, scribed, illustrated and claimed, it being unlntin thedotted line position of the spiral derstood that modifications maybemade drum 23, thedruin is frictionally engaged, .within the scope of'theclaim, without tie and the rotation of thespiral drum produces partingfrom the spirit of the invention. lateral movement of the ropes, withthe reln thedrawings forming part of'this ap sult thatthe latt r arethrownoff of Wheel plication, r M. This operation'takes place when thelever 25 Figure 1 shows a'portion of a drilling rig: 21 is thrown to thepositionof Figure 3.- in

in side elevation, the ropes leading" to the bull the full line positionof Figure 1 the lever 21 wheel at the left, being; adapted for engagehasplaced. the spiral drum out of service. ment by the drum, shown indotted line The bull wheel 14- is mounted on shaft 26, l 7 position. I 1and this shaft carries a Wheel 27 around which 0 Figure Qis anelevati onof the same strucbelt 28 passes, these elements having no pa"- ture,from another angle. t-icular bearing on the present"improvement '75)Figure Sis a PGI'C' ctive view of a crank which relates only to thethrowing off device. shaft adapted to mount the spiral drum, the Vfhatis claimed is: shaft having anup-turned portion at one A device forthrowing a rope from a wheel,

35 end, constituting a lever. said device comprising a spirally groovedA portion of a rig is shown conventionally drum mounted to impartlateral nioveinent and includes theelements 10,11, 12 and 13, a totherope with reference tothe drum, and a bull'ivheel at the left of theviewbeing desiglever controlled rock shaft of the crankshaft nated 14. ypemounting'thedrum formovement in an Ropes such as 15 pass over the wheel,and arc-shaped pathvwhile said drum i intains the latter is providedwith grooves 16 for the parallel relation with. the axis of re tioaccommodation of the ropes. and the object the Wheel. c 7 i r v I I ofthe presentdevice is to throw off the ropes I In testimony whereof laffix my signature. when required. w r GUYP. SLATE-RI n of i

